package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    // 创建业务层对象  多态

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
    UserService userService = new UserServiceImpl();
    
    req.setCharacterEncoding("utf-8");
    
        String action = req.getParameter("action");
        if('list',equals(action)){
            List<User> users =userService.findAll();
            //把数据放到请求域中
            req.setAttribute("users", users);
            //咋那个页面显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        }else if("add".equals(action)){
            //接受参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            int result = userService.addUser(new User(name, pass));
            if(result > 0){
                //使用重定向
                resp.sendRedirect("/user?action=list");
            }

        }
        else if("delete".equals(action)){
            //接收参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            int result = userService.deleteUser(id);
            if(result > 0){
                resp.sendRedirect("/user?action=list");
            }
            
        }else if("toupdate".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            User user = userService.findUserById(id);
            req.setAttribute("user", user);
            req.getRequestDispatcher("/update.jsp").forward(req, resp);

        }else if("update".equals(action)){
            //接收参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id, name, pass));
            if(result > 0){
                resp.sendRedirect("/user?action=list");
            }

        }
        List<User> users = userService.findAll();
        req.setAttribute("users", users);
        // 转发
        req.getRequestDispatcher("/list.jsp").forward(req, resp);
    }
}
